Introduction -- Historiography and sources -- GQG and the changing doctrine of trench warfare -- Writing a doctrine for trench warfare -- The artillery annex -- Orchestrating the break-in -- GQG as agent of liaison and arbiter of strategy -- Artillery -- The guns of August -- Pre-war doctrine -- Baptême de feu and the early trench battles -- The artillery revolution -- Manifest disarray (9-11 May) -- A tale of two divisions: introduction -- Plans and preparation -- From second Ypres to second Artois -- The first phase -- like marching in open terrain -- A tale of two divisions, Part i -- La Division Barbot -- 34e Division d'Infanterie -- Comparison159 -- Grignotage (12 May-12 June) -- The second phase -- fighting for a base de départ -- Partial offensives: 77e DI after 11 Nay -- Back to basics: 34e DI -- The second general offensive, 13-18 June -- The build-up to 16 June -- Phase three -- the second general offensive -- A tale of two divisions, Part II -- The attack on Chantecler -- In memory of Barbot: 77e DI's attack on Souchez -- A tale of two divisions: summary -- Conclusion: the impact of second Artois -- Appendix i.